Agilent Technologies 4294A Specifications download pdf (Page 101)

5-11. Battery measurement

The internal resistance of a battery is generally measured using a 1 KHz AC signal. When a battery

is connected directly to the auto balancing bridge type impedance measurement instrument, the

instrument becomes the DC load, typically 100 Ω for the battery. Figure 5-37 shows the recommend-

ed setup for this measurement. C1 and C2 block DC current flowing into the instrument. The value

of C1 should be calculated using the minimum measurement frequency. For example, when the

measurement is made at 1 kHz and above, C1 should be larger than 32 µF. The voltage rating of C1

and C2 must be higher than the output voltage of the battery.

Figure 5-37. Battery measurement setup

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Agilent Technologies 4294A Specifications Page 101